exhibition - the author develops a theme analyzing its various facets without necessarily taking sides, position yourself in front of him. This type of search text communication of knowledge through logical reasoning.
argumentative - the author wants to convince the receiver that the view given is also the best and, if appropriate, submit rebuttals to possible counter-argument.
It is crucial that (s) our (s) goal (s) is (are) very clear to ourselves: if the most important is the theme itself, our text will be an expository essay, but the most important is the our standpoint, our opinion on the subject, our thesis is argumentative.
The text dissertative should be clear, objective and consistent. Besides the selection of ideas to be analyzed and discussed, one must have a clear structure, consisting of three parts - the introduction, development and conclusion - that need to be strongly interconnected.